diff --git a/core/plug-in/sipctrl/sip_trans.cpp b/core/plug-in/sipctrl/sip_trans.cpp
index 2e162ab4..8217218b 100644
--- a/core/plug-in/sipctrl/sip_trans.cpp
+++ b/core/plug-in/sipctrl/sip_trans.cpp
@@ -91,6 +91,8 @@ timer* sip_trans::get_timer(unsigned int timer_type)
 
 
 char _timer_name_lookup[] = {'0','A','B','D','E','F','K','G','H','I','J','L'};
+#define timer_name(type) \
+    (_timer_name_lookup[(type) & 0xFFFF])
 
 /**
  * Resets a specific timer
@@ -104,7 +106,7 @@ void sip_trans::reset_timer(timer* t, unsigned int timer_type)
     
     if(*tp != NULL){
 
-	DBG("Clearing old timer of type %c\n",_timer_name_lookup[(*tp)->type]);
+	DBG("Clearing old timer of type %c\n",timer_name((*tp)->type));
 	wheeltimer::instance()->remove_timer(*tp);
     }
 
@@ -121,12 +123,12 @@ void trans_timer_cb(timer* t, unsigned int bucket_id, sip_trans* tr)
 	bucket->lock();
 	if(bucket->exist(tr)){
 	    DBG("Transaction timer expired: type=%c, trans=%p, eta=%i, t=%i\n",
-		_timer_name_lookup[t->type],tr,t->expires,wheeltimer::instance()->wall_clock);
+		timer_name(t->type),tr,t->expires,wheeltimer::instance()->wall_clock);
 	    trans_layer::instance()->timer_expired(t,bucket,tr);
 	}
 	else {
 	    WARN("Transaction %p does not exist anymore\n",tr);
-	    WARN("Timer type=%c will be deleted without further processing\n",_timer_name_lookup[t->type]);
+	    WARN("Timer type=%c will be deleted without further processing\n",timer_name(t->type));
 	}
 	bucket->unlock();
     }
@@ -144,16 +146,13 @@ void trans_timer_cb(timer* t, unsigned int bucket_id, sip_trans* tr)
 void sip_trans::reset_timer(unsigned int timer_type, unsigned int expire_delay /* ms */,
 			    unsigned int bucket_id)
 {
-    timer_type &= 0xFFFF;
-    assert(timer_type < sizeof(_timer_name_lookup));
-
     wheeltimer* wt = wheeltimer::instance();
 
     unsigned int expires = expire_delay / (TIMER_RESOLUTION/1000);
     expires += wt->wall_clock;
     
-    DBG("New timer of type %c at time=%i\n",
-	_timer_name_lookup[timer_type],expires);
+    DBG("New timer of type %c at time=%i (repeated=%i)\n",
+	timer_name(timer_type),expires,timer_type>>16);
 
     timer* t = new timer(timer_type,expires,
 			 (timer_cb)trans_timer_cb,